diff --git a/packages/primeng/src/tree/tree.ts b/packages/primeng/src/tree/tree.ts
index 2948576888d..47b85423263 100755
--- a/packages/primeng/src/tree/tree.ts
+++ b/packages/primeng/src/tree/tree.ts
@@ -231,7 +231,9 @@ export class UITreeNode extends BaseComponent implements OnInit {
     ngOnInit() {
         super.ngOnInit();
         (<TreeNode>this.node).parent = this.parentNode;
-        if (this.parentNode) {
+        const nativeElement = this.tree.el.nativeElement;
+        const pDialogWrapper = nativeElement.closest('p-dialog');
+        if (this.parentNode && !pDialogWrapper) {
             this.setAllNodesTabIndexes();
             this.tree.syncNodeOption(<TreeNode>this.node, <TreeNode<any>[]>this.tree.value, 'parent', this.tree.getNodeWithKey(<string>this.parentNode.key, <TreeNode<any>[]>this.tree.value));
         }